Explain the nature and function of an enrichment culture
What will be an ideal response?
Answer: Answers will vary, but an enrichment culture uses media, chemicals, or culture conditions to select for or encourage the growth of organisms with specific characteristics. An answer could describe providing only carbon dioxide as a source of carbon to select for autotrophs, for example.
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Which of the following is a way that humans have decreased the ability of infectious disease to limit human population growth?
a. migration b. birth control c. sanitation d. slow population growth
The two true pathogenic enteric genera of the Enterobacteriaceae are _____ and _____.
What will be an ideal response?
Which of the following is true of telomeres?
A. They have the sequence ATAGGG. B. They are at in the middle of chromosomes. C. Their sequence can change. D. They shorten with each round of cell replication. E. They have the sequence ATAGTG.
Why was the one gene: one enzyme hypothesis changed to one gene: one polypeptide chain?
a. because of the discovery of homomultimeric proteins b. because of the discovery of heteromultimeric proteins c. because of the discovery of ribozymes d. because not all enzymes are proteins e. because messenger RNA is used as the template for polypeptide synthesis